A friend  has this problem in his fs2002: when hit shift 02 or the gps icon in all the default planes only sees the black space. I checked if is the gps gauge is in the Gauges directory and I find :gps.gau; then I check the panel cfg in the 172 and the 737 default and the window 02 says gauge 00=gps!gps,0,0 150,250. Have I to check anything more  .Are those finding correct ? Any idea? Thanks a lot.